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Four-stroke model engines have been made in sizes as small as 0.20 in3 (3.3 cc) for the smallest single-cylinder models, all the way up to 3.05 in3 (50 cc) for the largest size for single-cylinder units, with twin- and multi-cylinder engines on the market being as small as 10 cc for opposed-cylinder twins, while going somewhat larger in size ...
These are fired with a butane flame from a burner in the engine's tender. AA Sherwood of Australia, an engineering lecturer, produced some miniature scale model live steam engines in the late 1960s and early 1970s. His smallest live steam engines were 1:240 scale which is smaller than the 1:220 of Z Scale. [3]
This engine was sold separately as "Thimble Drome" for the Champion car. In 1950 Roy ventured into engine manufacturing by teaming up with Mel Anderson to produce the O-Forty-Five Special car. This engine was .045 cubic inch and used some parts from Mel Anderson's Spitzy model airplane engine, however the bulk of the engine was Cox's design.
This engine cannot run properly with a muffler. Sub induction served to allow extra air into the cylinder at high engine speed. This increases the charge of mixture and makes the ignition timing track to engine speed to maintain power over a wider range of rpm. The cylinder head shown is of the low compression Bee type.
The result was the Space Bug .049 Contest engine, Cox's first model plane engine which was completed in October 1951. [7] In 1952 the first name change was made to L.M. Cox Manufacturing Company Inc. The Space Bug engine set the scene for all the Cox engines that followed, and went into full production in 1952.
Some of the engines were intended to do a job of work rather than for the entertainment of a model engineer, for example, the 1935 Sandhurst horizontal 2/3 bhp engine, which was described thus: [18] 'This engine will run on gas or petrol and is designed for continuous work such as dynamo, workshop or pump driving. It is supplied only as ...